Ideal for structural and general-purpose fastening applications where a hex-head drive is preferred. The Strong-Drive SDWH Timber-Hex screw is ideal for the contractor and do-it-yourselfer alike. It is code listed under IAPMO-UES ER-192 and meets 2015 and 2018 IRC® and IBC® code requirements for several common wood framing applications. Key Features SawTooth™ point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications Bold thread design provides superior holding power Underhead nibs that offer greater control when seating the head Large washer head provides maximum bearing area (0.64" head dia.) Size identification on all SDWH screw heads 5/16" hex drive (replacement driver bit — BITHEXR516-134) U.S. Patent 9,523,383